X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1993-10-15
1995-03-07
Church, Craig E.
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
378 989, H05G 164
Patent
active
053965302
ABSTRACT:
An energy difference picture processing method comprises the steps of using a semiconductor radiation detector; providing two discriminating levels; dividing X-rays, which have passed through objects, into two kind energy zones; counting X-ray photons to obtain an X-ray picture; assembling, with corresponding coefficients, S(H), S(L), {S(H)}.sup.x and {S(L)}.sup.y, which are exponential functions of the S(H) and S(L), respectively, where S(H) is a logarithmically converted version of a picture of counts in a higher energy band and S(L) is a logarithmically converted version of a picture of counts in a lower energy band; and performing addition, subtraction, multiplication and/or division on these terms to provide a picture in which a particular one of the materials constituting the objects is selectively extracted or removed.
REFERENCES:
patent: 4029963 (1977-06-01), Alvarez
patent: 4506327 (1985-03-01), Tam
patent: 4792900 (1988-12-01), Sones et al.
Japanese Journal of Medical Electronics and Biological Engineering, vol. 22, No. 1, pp. 53-60.
W. A. Kalender et al, An Algorithm for Noise Suppression in Dual Energy CT Material Density Images, I.E.E.E. Transactions on Medical Imaging, vol. 7, No. 3, pp. 218-224, Sep. 1988.
Baba Sueki
Ohmori Koichi
Ohtsuchi Tetsuro
Tsutsui Hiroshi
Watanabe Masanori
Church Craig E.
Matsushita Electric - Industrial Co., Ltd.
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